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2 years ago

In the octapeptide ITPGAALY which amino acid is the amino-terminal residue? Tyrosine Leucine Proline Isoleucine

Chemistry

1 answer:

oee [108]2 years ago

5 0

Answer:

The correct option is: Isoleucine

Explanation:

Peptides are the biological molecules containing amino acids which are linked together by peptide bonds. A polypeptide is a peptide chain in which more than 20 amino acids are linked together by peptide bond.

All polypeptide chains have a N-terminal and a C-terminal.

The N-terminal of a polypeptide is also known as the amino terminal. The N-terminal has a free amine group, which is generally on the left hand side of the polypeptide chain.

Therefore, the N-terminal or the amino terminal of the given polypeptide is Isoleucine (I).

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3. A 0.500 g sample of nitrogen gas combines with 1.140 g of oxygen gas to form NO2. If the atomic mass of oxygen is 16.000, cal

DedPeter [7]

Answer;

= 18.24

Explanation;

The ratio of N and O in the formula NO2 IS 1:2

Mass of nitrogen gas is 0.500 g

Moles of nitrogen will be;

= 0.500/16 = 0.03125 moles

Therefore;

The moles of Oxygen from the ratio will be;

= 0.03125 × 2 = 0.0625 moles

But; 0.0625 moles is equal to 1.140 g of Oxygen

The atomic number (mass in 1 mole) will be;

= 1.140 /0.0625

= 18.24

Thus the atomic number of Oxygen from the data is 18.24

6 0

2 years ago

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Given the equation representing a reaction at equilibrium: h2s(aq) ch3nh2(aq) hs(aq) ch3nh3 (aq) according to one acid-base theo

alekssr [168]

Since in the forward reaction, H2S is giving a proton away (being the acid) and then CH3NH2 accepting that proton given (being the base).

8 0

2 years ago

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Magnesium metal burns with a bright white flame. What conclusions can you draw about the electron transitions that can take plac

Verizon [17]

Different wavelength are involved.

Explanation:

If magnesium burns with a bright white flame, one can conclude that different wavelengths accompany the electron transitions for the magnesium atom.

When an atom burns, the electrons in it are excited.
They give out characteristic light commensurate with their energy.
A white light is made up of different combinations of wavelength of radiations.
When we see a white light we can infer that different joined together in the emission observed.

Learn more:

Spectrum brainly.com/question/6255073

#learnwithBrainly

3 0

2 years ago

Orange juice has a ph of 4. What is its relative acidity compared to pure water, which has a ph of 7? Orange juice has a ph of 4

Nata [24]

Answer:- Third option is correct, relative strength of orange juice to pure water is 1000 times

Solution:- pH is a way to represents the strength of the acids. Lower is the pH higher is the acid strength and higher is the pH lower is the acid strength. So, we could say that acid strength is inversely proportional to the pH.

From given pH value, we calculate the hydrogen ion concentration and then compare the hydrogen ion concentrations of the two acids to find out the relative strength.

$[H^+]=10^-^p^H$

$[H^+]$ for orange juice = $10^-^4$ and for pure water it is $10^-^7$ .

So, the relative acidity of orange juice compared to pure water = $\frac{10^-^4}{10^-^7}$

= 1000

So, third option is correct, the relative strength of orange juice to pure water is 1000 times.

4 0

2 years ago

The graph shows the reaction pathway for the reaction Q + R N + M. Interpret the graph by describing what each of the letters (A

Vladimir [108]

Answer: The reaction is exothermic reaction as the energy of products is less than the energy of reactants.

Explanation: Exothermic reactions are defined as the reactions in which energy of the product is less than the energy of the reactants. The total energy is released in the form of heat and $\Delta H$ for the reaction comes out to be negative.

Labeling of the parts in the diagram:

A represents the activation energy which is the energy required by reactants to cross the energy barrier to get converted to products.

E represents the potential energy of the reactants.

B represents the activated complex.

D represents the potential energy of the products.

C represents the total enthalpy change of the reaction, which comes out to be negative for exothermic reactions.

$\Delta H=E_P-E_R$

7 0

2 years ago

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